I'm always amazed that people here don't give cyclists credit for being vulnerable to human ailments. Today was the eighth stage in a row, the weather has been rough, they're doing long transfers, shoving down gels or whatever on the road, meeting fans and the press, and you don't think it's possible that some illness could get passed around just like in an office or on the subway?
As for Astana being weak, the only common factor between the Giro and Tour teams is Vino if he rides. Contador gets a selection from Pereiro, de la Fuente, Noval, Navarro, Zeits, Fofonov, Maxim Iglinsky, Hernandez, Allan Davis, and a few others who also weren't at the Giro. The team will be lead by Martinelli. La Page did the Giro.
I don't know how Radio Shack and Saxo Bank could team up against Contador. First of all, it's not him against the world. If someone goes up the road that he has to chase, say Andy Schleck, every Radio Shack contender would have to go along or risk losing time, and Wiggins would, and Frank would, and Liquigas leaders and anyone else who hopes to compete, and they'd bring along any helpers who are able. Andy wouldn't want to end up with the same time in the mountains as guys who can beat him in the Time Trial, so he needs to beat Radio Shack. And it's not like other teams won't initiate attacks on Radio Shack and Saxo Bank.
The way to make Astana work is to put Contador in the yellow jersey and keep him there, but on sprint days for example, if there's not a GC threat in the break, it will be up to teams with sprinters to bring them back.
There are 22 teams this year, Schleck hasn't hit form, and Armstrong hasn't done anything. They've got their Dream Team minus Kloden at ATOC, and they're in third right now. Why aren't they practicing world domination on Bonny Doon if they think they'll be able to do it on the Tourmalet twice? This is their second biggest race of the year, and one they've worked towards all season?